Bump the client-side timeout for /state (#14912)

* Bump the client-side timeout for /state to allow faster joins resyncs the chance to complete for large rooms. We have seen this fair poorly (~90s for Matrix HQ's /state) in testing, causing the resync to advance to another HS who hasn't seen our join yet. * Changelog * Milliseconds!!!!
matrix-org · Jan 25, 2023 · 8e37ece · 8e37ece
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diff --git a/changelog.d/14912.misc b/changelog.d/14912.misc
@@ -0,0 +1 @@
+Faster joins: allow the resync process more time to fetch `/state` ids.
diff --git a/synapse/federation/transport/client.py b/synapse/federation/transport/client.py
@@ -102,6 +102,10 @@ async def get_room_state(
             destination,
             path=path,
             args={"event_id": event_id},
+            # This can take a looooooong time for large rooms. Give this a generous
+            # timeout of 10 minutes to avoid the partial state resync timing out early
+            # and trying a bunch of servers who haven't seen our join yet.
+            timeout=600_000,
             parser=_StateParser(room_version),
         )